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The concentration of NZ-419 (5-hydroxy-1-methylimidazolidine-2,4-dione), an intrinsic antioxidant, has been shown to increase in the sera of animals and patients with chronic renal failure (CRF). This is the first report that orally administered exogenous NZ-419 prevents the initiation and/or progression of CRF in rats using an adenine-loaded model. After 24 d of adenine loading, there was a ca. 90% decrease in creatinine clearance (C(Cr)) in the control rats. Treatment with NZ-419 from the beginning significantly inhibited the decrease in C(Cr) and also the increase in serum creatinine (sCr). Bio-markers for in vivo hydroxyl radicals, the serum methylguanidine (sMG) level, and sMG/sCr molar ratio, not only in serum but also in the urine, kidney, liver, and muscle indicated that NZ-419 inhibited the increase in oxidative stress induced by CRF in rats. An increase of guanidinosuccinic acid, an another bio-marker of oxidative stress, was also inhibited with NZ-419.

biological and pharmaceutical bulletin

First Indications Demonstrating the Preventive Effects of NZ-419, a Novel Intrinsic Antioxidant, on the Initiation and/or Progression of Chronic Renal Failure in Rats